mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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At #JoinJabber we aim to grow sustainably. As part of that we put high standards for inclusivity and safety to all of the communities we collaborate with. You will never see us at a police conference asking for money for example. ;)
If that sounds like what you want you can join in joinjabber.org or host an #xmpp server next to your mastodon server joinjabber.org/tutorials/integ

JoinJabberJoinJabber

Delta Chat is a free open source encrypted messaging system that works through email (so it is federated too). You can follow at:

➡️ @delta

There are apps for Android, iPhone/iPad, Linux, Mac and Windows. More info at delta.chat

(You can also message people on conventional email accounts unencrypted.)

delta.chatDelta Chat: The e-mail messengerChat over e-mail and head back to the future with us! Delta Chat is like Telegram or Whatsapp but without the tracking or central control. Delta Chat does not need your phone number. Check out our ...

Dino is a free open source XMPP/Jabber messaging app for Linux and BSD desktop computers. You can follow at:

➡️ @dino

The official site is at dino.im

Dino supports end-to-end encrypted messaging through OMEMO, and they are now testing encrypted video calls too.

dino.imDino. Communicating happiness.A privacy-friendly messaging app for the desktop. It uses the XMPP protocol and provides a clean UI with modern features.
#Dino#DinoIM#XMPP

Snikket is a new XMPP/Jabber-based decentralised FOSS messenger service. You can follow at:

➡️ @snikket_im

The official website is snikket.org

It aims to make XMPP into a more viable alternative to Whatsapp etc by providing consistency in design and terminology.

(It's sort of how Mastodon made ActivityPub more mainstream, by using consistency to make it clear the instances are part of one network.)

snikket.orgSnikket ChatSnikket is a simple, secure and private messaging app